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Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) $ / shares in Thousands, $ in Thousands | Dec. 31, 2017 | Jun. 30, 2017
--- | --- | ---
Allowance for doubtful accounts | $ 475 | $ 506
Preferred shares, par value (in dollars per share) | $ 0 | $ 0
Preferred shares, authorized shares (in shares) | 1,000,000 | 1,000,000
Preferred shares, issued (in shares) | 0 | 0
Common shares, par value (in dollars per share) | $ 0 | $ 0
Common shares, authorized (in shares) | 40,000,000 | 40,000,000
Common shares, outstanding (in shares) | 25,562,003 | 24,429,223

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